Word types, also known as parts of speech, categorize words based on their function in a sentence. The main types include nouns, which name people, places, or things; verbs, which express actions or states; and adjectives, which describe nouns. Other types include adverbs, which modify verbs, adjectives, or other adverbs; pronouns, which replace nouns; and prepositions, which show relationships between words. Understanding word types helps in constructing clear and effective sentences. For example, using the correct verb can change the meaning of a sentence, while the right adjective can provide more detail. Recognizing these categories enhances both writing and comprehension skills.